Imagine your original mixture had contained a component capable of sublimation, such as naphthalene. When would be best time to remove this volatile component so the other procedural steps would still work: before step (1), after (1), after (2), or after (3)? Why? How could the volatile component then be collected as a solid?
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Imagine your original mixture had contained a component capable of sublimation, such as naphthalene. When would be best time to remove this volatile component so the other procedural steps would still work: before step (1), after (1), after (2), or after (3)? Why? How could the volatile component then be collected as a solid?
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- a.Why can’t the elements of a compound be separated from one another by physical means? b.An Alka-Seltzer antacid tablet reacts vigorously with water. But how does this tablet react to a a solution of half water and half corn syrup? Propose an explanation involving the relationship between reaction speed and the frequency of molecular collisions.Explain why scientists do not use a standard set of steps for everyinvestigation they conduct.Choose all that apply. In Experiment 4, we use a mixture of 50% water and 50% isopropyl alcohol as the solvent. Why do we use this mixture rather than using pure water as the solvent? O The isopropyl alcohol is needed to act as a catalyst for the reaction to occur. There would be too much of a reactant that it would distort the reaction rate. t-butyl chloride is has low solubility in pure water. The hydrolysis reaction would occur too quickly in pure water to have good measurements for analysis. The isopropyl alcohol is necessary for the reaction to occur.
- (NH4)2Cr2O7 (s) --> Cr2O3 (s) + 4 H2O (g) + N2 (g) The compound Ammonium Dichromate, (NH4)2Cr2O7, will decompose into Cr2O3, H2O, and N2, when it is heated vigorously. However, it is almost impossible to acquire a pure sample of (NH4)2Cr2O7 , instead (NH4)2Cr2O7 is usually contaminated with some Cr2O3 in its container. To determine how much Cr2O3 is in the container, a student heats a sample of the mixture, and collects the water vapor using a drying agent. The following table shows the data the student recorded during the heating of a sample of the mixture. Mass of Empty Test Tube 14.66 g Mass of Test Tube and Mixture before Heating 16.92 g Mass of Drying Agent Before Reaction 2.26 g Mass of Drying Agent and Water After Reaction 2.65 g a) Calculate the grams of (NH4)2Cr2O7 present in the mixture in the test tube before the mixture was heated. b) Determine the mass percent of (NH4)2Cr2O7 in the mixture. c) If the student spilled some of the mixture out of the test tube…3. Suppose you have a mixture of saturated aqueous sodium chloride (brine) and your 2-chloro-2-methylbutane product in a separatory funnel. Use densities to predict which phase will be the top layer in the funnel. a. 2-chloro-2-methylbutane (organic phase) b. saturated sodium chloride (aqueous phase) c. hard to predict since densities are both very close to 1.18 g/mL d. there would only be one phase since the substances are miscibleWhat will happen to Dichloromethane when it is added to Silver nitrate? Does it gives a postive solution? Give an inference why
- Consider the reaction below and answer the question below the reaction. A student performed a synthesis of ethyl 4-aminobenzoate (C) as shown in the reaction above. The student added 1.20 g of 4-aminobenzoic acid and 12.0 mL of ethanol together in the presence of sulfuric acid. The reaction mixture was heated to reflux for a period of 45 minutes. H₂N OH + CH3CH₂OH ethanol ethanol MM 46.10 g/mol 4-aminobenozoate sulfuric acid H+ 4-aminobenzoic acid H₂N 4-aminobenzoic acid MM 137.14 g/m ol A B In the catalyzed reaction, which of the following is used as a catalyst? OCH₂CH3 + H₂O ethyl 4-aminobenzoate MM 165.19 g/mol сQ2. What does “crude” product mean? Q3. What is the advantage of using Buchner filtration in filtering crystals? Q4. Briefly explain how scratching the wall of the glass flask can help formation of crystals. Q5. Briefly explain why crystals form as the solvent cools during recrystallization.CHEM 330 Conferences 2. For the reaction: a) HBr(g) = H2(g) + Br2(g) HBr 1/2 (H₂)2 (Br₂)" HBr (H₂Br₂) ¹/2 b) 2HBr(g) H2(g) + Br2(g) boefficient H2(g) + Br2(g) theachartseefficient 2HBr(g) Kp = 3.5 x 104 at 1495 K. What is the value of Kp for the following reactions at 1495 K? c) H2(g) + Br2(g) = HBr(g) Kp = (Product) foe 5: Equilibrium HBr √ H₂ Br₂
- 2. Determine the concentration (mg/m³ and ppm) of benzene in a closed room (300 m') if 3.20 grams are spilled. Assume that it all evaporates instantaneously, and that the air in the room is well mixed. Next, allow the room's air to change once in 20 minutes. How long will it take until the concentration in the room is reduccd by 50%? How long until the concentration is below the recommended NIOSH limit (1 ppm)? Note that 1 ppm is equivalent to 3.25 mg/m' for benzene.solve quickly. To get iron(ll) sulphide from FeCl3 …………….. a. Adding NaOH, heating > 200 °C, reduction then Δ/S b. Reduction, heating > 200 °C, adding NaOH then Δ/H2S c. Heating > 200 °C, reduction, heating /S then add NaOH d. AllMy teacher didn't explain how to do this type of problem. Can someone show me how to solve part c?